Low temperature Moessbauer spectra of the Ibitira meteorite (achondrite)

Details Low temperature Moessbauer spectra of the Ibitira meteorite (achondrite) Low temperature Moessbauer spectra of the Ibitira meteorite (achondrite)

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phys...40..702c&link_type=abstract

Physica Scripta (ISSN 0031-8949), vol. 40, no. 5, Nov. 1989, p. 702-704. Research supported by CNPq and FINEP.

Physics

2

Achondrites, Magnetic Relaxation, Meteoritic Composition, Mossbauer Effect, Spin-Spin Coupling, Iron Meteorites, Low Temperature, Metal Ions, X Ray Diffraction

Scientific paper

The Moessbauer spectra of a powdered sample of the Ibitira meteorite (achondrite) have been obtained at different temperatures, ranging from 4.2 K up to 300 K. X-ray diffraction analysis indicates that the meteorite consists mostly of anorthite CaAl2Si2O8 and pigeonite (Mg, Fe, Ca)2Si2O6. The Moessbauer spectrum at room temperature consists of an asymmetric doublet with parameters characteristic of iron in the oxidation state Fe II. No magnetic effects were observed between 300 and 14 K. The spectrum obtained at 4.2 K exhibits magnetic relaxation.

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